P1_VBAT is used as a backup supply for the SoC PSBATT (RTC function), its typical voltage is 3V.
If RTC is not required, P1_VBAT can be left unconnected.
Refer to Hardware Datasheet – Section “Technical Specification” for details.
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Please find the detailed product information here:
RFSoC ADC DAC 3U VPX Plug-in Module